A scholar and practitioner specializing in Foreign Policy Crisis and crisis management, Dr Yishayahu is presently serving as a Visiting Lecturer at the University of London (City), where he completed his PhD, and a Research Fellow at the International Institute for Counter-Terrorism, Reichman University (IDC Herzliya).  Dr Yishayahu was previously a Visiting Scholar at the Department of Politics and International Studies (POLIS) at the University of Cambridge. His research focuses on contemporary Foreign Policy Crises and their implications on the discipline of crisis management.